Updating a prenup

Updating a prenuptial agreement (prenup) after significant life changes such as having children, selling a business, or receiving an inheritance is essential to ensure the agreement reflects your current circumstances fairly and legally. In England and Wales, while prenuptial agreements are not automatically legally binding, they carry substantial weight in courts if they are fair, entered into freely and with full financial disclosure. This article explores why and how to update a prenup, the legal considerations, and practical steps to help you navigate this process effectively.

Why You Should Update Your Prenup after Major Life Changes

Life changes can drastically alter your financial landscape and family dynamics. Prenups established before marriage typically reflect circumstances at that time, which may no longer be relevant or sufficient to protect your interests.

– Children: The birth or adoption of children changes financial responsibilities and priorities. Courts prioritise children’s welfare during divorce settlements, which can override original prenup terms. Updating the agreement allows you to address child-related financial planning more clearly, even if custody and support arrangements remain court-decided.

– Business Sale or Acquisition: If you or your partner sell a business or acquire significant new business assets, the value and nature of your wealth change. An updated prenup can clarify how proceeds or business assets are managed or divided, preventing future disputes.

– Inheritance: Receiving a significant inheritance can impact financial fairness between spouses. Revising your prenup helps protect the inheritance as a separate asset, clarifies whether it is shared, and outlines its treatment upon divorce or death.

Leaving a prenup outdated risks unfairness and potential legal challenge, as courts assess whether agreements remain equitable and reflective of the parties’ circumstances at separation.

Legal Framework for Updating Prenups in England and Wales

Prenuptial agreements in England and Wales are not, by statute, automatically enforceable, but courts respect them heavily following the landmark Radmacher v Granatino (2010) case. To have the best chance of enforcement, updated prenups or postnuptial agreements should meet these key criteria:

– Both parties must enter the agreement freely and voluntarily without coercion or undue pressure.

– Full and honest financial disclosure from both spouses is essential.

– Both parties should receive independent legal advice to understand the agreement and its implications.

– The agreement must be fair, considering the parties’ needs and any dependents.

– Updating the agreement should be carefully documented, reflecting current laws and changed circumstances.

If a prenup is updated during the marriage, the new document may be called a postnuptial agreement. Like a prenup, it should meet the fairness and transparency standards to ensure a court upholds it if ever challenged.

How to Update Your Prenuptial Agreement

Updating a prenup requires a thoughtful approach centred on communication, legal advice and formal documentation. Below are the essential steps:

1. Open and Honest Communication

Start with a frank discussion between both partners regarding the reasons for revisiting the agreement. Whether prompted by children, business changes or inheritances, both parties need to agree on the importance of updating and be committed to fairness.

2. Seek Independent Legal Advice

Both spouses need to obtain separate legal advice from family law solicitors specialising in prenups. Solicitors can explain the legal implications of changes, ensure compliance with updated laws, and help protect your individual interests.

3. Full Financial Disclosure

Each party must provide comprehensive information about assets, liabilities, income, business interests and inheritances acquired since the original prenup. Full transparency is critical to avoid the agreement being challenged later for nondisclosure.

4. Revise the Agreement Terms

Working with your solicitor, revise the prenup provisions to reflect current circumstances. Important areas to cover include:

– Treatment of new children or dependents

– Division of new or sold business assets

– Protection or sharing of inherited assets

– Spousal maintenance adjustments

– Savings, investments or pension updates

5. Formalise the Updated Agreement

Once revisions are complete, sign the new or updated agreement in the presence of witnesses or a notary if preferred. Both parties should keep copies in secure places for future reference.

6. Periodic Review

Life changes continually, so consider regular reviews every few years or after further significant events to keep the agreement relevant.

Practical Considerations and Challenges

– Disagreement on Updates: If one spouse resists updating the prenup, mediation or negotiation with legal support may resolve disputes. Courts will expect reasonable negotiations and fairness for enforceability.

– Costs: Legal fees vary with complexity but expect solicitor fees for drafting, reviewing and negotiations. Early planning can help budget for these expenses.

– Court Scrutiny: Courts have discretion and will assess updated prenups based on fairness, transparency and whether they meet the needs of both spouses and children. Extreme unfairness can lead to parts being set aside.

– Emotional Impact: Discussing finances and prenups during a marriage demands sensitivity and clear communication. Professionals can facilitate constructive dialogue.

Case Law Insights: What the Courts Look For

The Supreme Court case Radmacher v Granatino established that courts should respect prenups where they are freely entered into with full information and fairness. However, courts will not uphold agreements that leave one spouse in real need or ignore the contributions of homemaking and childcare.

More recent decisions, such as MN v AN (2023), stress voluntary consent without coercion and ongoing fairness as prerequisites for enforcement. Courts weigh children’s welfare heavily, which can override financial agreements that ignore reasonable child support needs.

Conclusion

Updating your prenuptial agreement after major life changes such as having children, selling a business or receiving an inheritance is vital to keeping your financial arrangements clear, fair and legally sound. By communicating openly, securing independent legal advice, and revising terms comprehensively, couples ensure their agreement remains relevant and offers real protection.

Prenups are not fixed documents; rather, they should evolve with your lives. Reviewing and updating these agreements reflects responsible financial planning and reduces uncertainty in the event of marital breakdown. Consulting experienced family solicitors familiar with English and Welsh law will help you achieve a balanced and enforceable agreement.

Taking these steps now safeguards your financial future while respecting your family’s changing needs.

If you would like professional advice on updating your prenuptial agreement or need assistance drafting a postnuptial agreement, consulting with us, experienced family law solicitors is highly recommended. Early legal guidance ensures you create an agreement best suited to your unique and evolving circumstances.

At Alexander JLO we have many years of experience of dealing with all aspects of family law and will be happy to discuss your case in a free no obligation consultation. Why not call us on +44 (0)20 7537 7000, email us at info@london-law.co.uk or get in touch via the contact us button and see what we can do for you?

This blog was prepared by Peter Johnson on 16th October 2025 and is correct at the time of going to press. With over forty years of experience in almost all areas of law Peter is happy to assist with any legal issue that you have. He is widely regarded as one of London’s leading divorce lawyers. His profile on the independent Review Solicitor website can be found Here. To follow up on any of the above please contact Guy Wilton of our family department. Guy has wide experience of acting for the firm’s clients, their family and their businesses. Guy’s experience as a lawyer started in the Northern and Welsh Circuits, including the Liverpool Courts, where he represented numerous clients after being called to the Bar, before opting to join Alexander JLO in 2017 and qualifying as a solicitor in 2024.He is a highly experienced family lawyer with a particular interest in financial remedy proceedings and child contact disputes.

 Guy’s profile on the independent Review Solicitor website can be viewed here.